Snapping shrimps use a special shaped claw to generate a cavitating high speed water jet. Cavitation formed in this way, may be used for hunting/stunning prey and communication. The present work is a novel computational effort to provide insight on the mechanisms of cavitation formation during the claw closure. The geometry of the claw used here is a simplified claw model, based on prior experimental work. Techniques, such as Immersed Boundary and Homogenous Equilibrium Model (HEM), are employed to describe the claw motion and cavitating flow field respectively. The simulation methodology has been validated against prior experimental work and is applied here for claw closure at realistic conditions. Simulations show that during claw closure, a high velocity jet forms, inducing vortex roll-up around it. If the closure speed is high enough, the intensity of the swirling motion is enough to produce strong depressurization in the vortex core, leading to the formation of a cavitation ring. The cavitation ring moves along the jet axis and, soon after its formation, collapses and rebounds, producing high pressure pulses.

中文翻译：

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揭示手枪虾空化背后的物理机制。

鳄虾使用特殊形状的爪来产生空化的高速水射流。以这种方式形成的空化可用于狩猎/惊吓猎物和交流。当前的工作是一种新颖的计算工作，以提供对爪闭合过程中气穴形成机理的见解。基于先前的实验工作，此处使用的爪的几何形状是简化的爪模型。采用沉浸边界和均质平衡模型（HEM）等技术分别描述了爪运动和空化流场。该模拟方法已针对先前的实验工作进行了验证，并在此处用于实际条件下的爪闭合。仿真表明，在闭合爪子过程中，形成了高速射流，从而引起涡旋在其周围卷起。如果关闭速度足够高，涡旋运动的强度足以在旋涡芯中产生强烈的降压，从而导致空化环的形成。空化环沿射流轴移动，形成后不久便崩溃并反弹，从而产生高压脉冲。